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Basic and Diluted Earnings Per Share (Tables) | 12 Months Ended
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May 31, 2012
Basic and Diluted Earnings Per Share [Abstract] |
Basic and diluted earnings per share |
|  | Year ended May 31, |
In millions, except per share amounts |  | 2012 |  |  | 2011 |  |  | 2010 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 548.0 |  |  | $ | 515.3 |  |  | $ | 477.0 |
Weighted-average common shares outstanding |  |  | 362.4 |  |  |  | 361.8 |  |  |  | 361.4 |
Basic earnings per share |  | $ | 1.51 |  |  | $ | 1.42 |  |  | $ | 1.32 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 548.0 |  |  | $ | 515.3 |  |  | $ | 477.0 |
Weighted-average common shares outstanding |  |  | 362.4 |  |  |  | 361.8 |  |  |  | 361.4 |
Dilutive effect of common share equivalents at average market price |  |  | 0.6 |  |  |  | 0.6 |  |  |  | 0.3 |
Weighted-average common shares outstanding, assuming dilution |  |  | 363.0 |  |  |  | 362.4 |  |  |  | 361.7 |
Diluted earnings per share |  | $ | 1.51 |  |  | $ | 1.42 |  |  | $ | 1.32 |
Weighted-average anti-dilutive common share equivalents |  |  | 9.9 |  |  |  | 11.5 |  |  |  | 13.0 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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